shall `make uninstall' remove directories?

[Assar Westerlund]

Currently automake does not remove directories in `make uninstall' and
I did not find any text regarding this in the GNU coding guidelines
either.  So what's the right thing to do here?

a) always remove the directories
b) just remove the directories that were created during `make install'
c) remove the last level of directory if it's empty
d) remove all the levels that are empty

a) seems obviously wrong.  b) requires keeping track.  c) requires an
unminstall-dirs. but d) almost seems to make sense.

Any comments?

/assar